title: Plasmonic resonance of whispering gallery modes in an Au cylinder.
abstract: We demonstrate whispering gallery (WG) resonance of surface plasmon polaritons (SPPs) in a 2-dimensional confined Au cylinder by self interference. Despite the leakage of SPPs along the axis of the cylinder, Q factors of 375 are obtained in a cylinder with diameter of 30 μm. The coupling-angle-dependence of the WG resonance is also investigated. Our results open opportunities for a new category of plasmonic cavities with 2-dimensional confinement, and this may be applied to a variety of simple and natural metallic micro or nanostructures.
authors.affiliation: State Key Laboratory of Modern Optical Instrumentation, Department of Optical Engineering, Zhejiang University, Hangzhou, China.
authors.forename: Xining
authors.initials: X
authors.lastname: Zhang
authors.forename: Zhe
authors.initials: Z
authors.lastname: Ma
authors.forename: Huakang
authors.initials: H
authors.lastname: Yu
authors.forename: Xin
authors.initials: X
authors.lastname: Guo
authors.forename: Yaoguang
authors.initials: Y
authors.lastname: Ma
authors.forename: Limin
authors.initials: L
authors.lastname: Tong
mesh_terms: D003198:Computer Simulation; D006046:Gold / Q000737:chemistry*; D008027:Light; D008956:Models, Chemical; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D006046:Gold